fix: Handle TypeAliasType within TypeContext lookups

[seandstewart]

• Resolves an issue where nested type alias types would cause a KeyError with direct lookups from the type context

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 72.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 96.50%. Comparing base (ff01211) to head (1295bed).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/typelib/py/inspection.py	53.84%	4 Missing and 2 partials ⚠️
src/typelib/ctx.py	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
- Coverage   96.84%   96.50%   -0.35%     
==========================================
  Files          21       21              
  Lines        1492     1516      +24     
  Branches      267      273       +6     
==========================================
+ Hits         1445     1463      +18     
- Misses         28       33       +5     
- Partials       19       20       +1     

Flag	Coverage Δ
unittests	96.24% <72.00%> (-0.35%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.